Organic electroluminescent display apparatus

Abstract

An organic electroluminescent (EL) display apparatus includes a plurality of pixels each having a first region and a second region of the same hue. The first region and the second region each include an organic EL element including a first electrode, an organic EL layer including a light-emitting layer, and a second electrode. The second region further includes a lens disposed on the light exit side of the second electrode. The organic EL element in the second region in at least part of the pixels is configured to meet 0.9<2L/λ+φ/2π<1.1.

1 . An organic electroluminescent (EL) display apparatus, comprising:
 a pixel having a first region and a second region of the same hue,   the first region and the second region each including an organic EL element including a first electrode, a second electrode, and an organic EL layer including a light-emitting layer and disposed between the first electrode and the second electrode,   the second region further including a lens disposed on a light exit side of the organic EL element,   wherein the organic EL element in the second region meets the following formula:
   0.9<2 L   1 /λ+φ 1 /2π<1.1
 
   
       where L 1  indicates an optical path between the light-emitting layer and a reflective surface of the first electrode, λ indicates a wavelength of light emitted from the light-emitting layer which is intensified due to optical interference, and φ 1  indicates an amount of phase shift caused when the light is reflected by the reflective surface of the first electrode. 
     
     
         2 . The organic EL display apparatus according to claim  1 ,
 wherein the organic EL element in the second region meets the following formulas:
     L   2 >0 and 2 L   2 /λ+φ 2 /2π<1
 
   
       where L 2  indicates an optical path between the light-emitting layer and a reflective surface of the second electrode, and φ 2  indicates an amount of phase shift caused when the light emitted from the light-emitting layer is reflected by the reflective surface of the second electrode. 
     
     
         3 . The organic EL display apparatus according to  claim 1 ,
 wherein the organic EL element in the first region meets the following formula:
     m− 0.1<2 L   1 /λ+φ 1 /2π< m+ 0.1
 
   
       where m is a positive integer. 
     
     
         4 . The organic EL display apparatus according to  claim 1 ,
 wherein the organic EL element in the first region meets the following formula:
   0.9<2 L   1 /λ+φ 1 /2π<1.1.
 
   
     
     
         5 . The organic EL display apparatus according to  claim 1 , further comprising a pixel driving circuit configured to selectively drive the first and second regions of each pixel in accordance with a manner in which the first electrodes are connected. 
     
     
         6 . The organic EL display apparatus according to  claim 5 , wherein, when the first electrodes in the first and second regions are interconnected, the pixel driving circuit drives the first and second regions simultaneously. 
     
     
         7 . The organic EL display apparatus according to  claim 5 , wherein, when the first electrodes in the first and second regions are not interconnected, the pixel driving circuit drives the first and second regions independently. 
     
     
         8 . An organic electroluminescent (EL) display apparatus, comprising:
 an array of pixels arranged in a matrix of rows and columns, each pixel having a first emitting region and a second emitting region;   an organic EL element including a first electrode, a second electrode, and an organic EL layer including a light-emitting layer, the organic EL element being disposed between the first electrode and the second electrode under each of the first emitting region and second emitting region of each pixel;   a lens stacked on one of the first emitting region and second emitting region on a light emitting side of the organic EL element,   wherein the organic EL element corresponding to the one of the first emitting region and second emitting region on which the lens is tacked satisfies the following condition:
   0.9<2 L   1 /λ+φ 1 /2π<1.1
 
   where L 1  represents an optical path between the light-emitting layer and a reflective surface of the first electrode, λ represents a wavelength emitted by the light-emitting layer, and φ 1  indicates an amount of phase shift caused when light emitted from the light-emitting layer is reflected by the reflective surface of the first electrode.